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Layers of lava flows and tuff from the dormant volcano on Isla Tortuga, Baja California, Sea of Cortez, Mexico, North America

Layers of lava flows and tuff from the dormant volcano on Isla Tortuga, Baja California, Sea of Cortez, Mexico, North America

Minaret, volcanic tuff pillars and erosion surrounding Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Rust-colored volcanic tuff cliffs of Brown Bluff, eastern side of the Tabarin Peninsula, Weddell Sea, Antarctica, Polar Regions

Pitt Point, a volcanic tuff formation on San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Rust-colored volcanic tuff cliffs of Brown Bluff, eastern side of the Tabarin Peninsula, Weddell Sea, Antarctica, Polar Regions

Rust-colored volcanic tuff cliffs above a dark material filled glacier at Brown Bluff, eastern side of the Tabarin Peninsula, Weddell Sea, Antarctica, Polar Regions

Erosion with volcanic tuff pillars, Pasabagi, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Rust-colored volcanic tuff cliffs above a dark material filled glacier at Brown Bluff, eastern side of the Tabarin Peninsula, Weddell Sea, Antarctica, Polar Regions

Erosion with volcanic tuff pillars, Pasabagi, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Erosion with volcanic tuff pillars. Pasabagi, near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Erosion with volcanic tuff pillars, Pasabagi near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Erosion with volcanic tuff pillars, Pasabagi near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

A young girl sitting against the walls of Bet Medhane Alem (Church of the World Savior) in Lalibela, Ethiopia

Rock hewn monolithic church of Bet Golgotha (House of Golgotha Mikael), known for its arts and said to contain the tomb of King Lalibela) in Lalibela, Ethiopia

A woman sits in front of a painting of jesus Christ inside the church of Bet Medhane Alem (Church of the World Savior) in Lalibela, Ethiopia

Rock hewn monolithic church of Bet Golgotha (House of Golgotha Mikael), known for its arts and said to contain the tomb of King Lalibela) in Lalibela, Ethiopia

A man sits near a collection of Christian artwork within the church of Bet Medhane Alem (Church of the World Savior) in Lalibela, Ethiopia

Aerial view of Windsborn crater lake, rural district of Daun, Eifel, Rhineland Palatinate, Gemany, Europe

Aerial view of Windsborn crater lake, rural district of Daun, Eifel, Rhineland Palatinate, Gemany, Europe

Tufa Fairy Chimneys with basalt blocks placed on top, rock formations at Cavushin, Goreme, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey

Tufa Fairy Chimneys with basalt blocks placed on top, rock formations at Cavushin, Goreme, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey